Prop choices for OS 91FX

[randy10926 at comcast.net]

The gentleman said he was looking for a prop to use with a stock muffler.  This appears to limit the choices to APC 13X8, 14X7, 15X6 and maybe a 14X8.  In my readings and experiments with this engine on a stock muffler it seems the APC 14X7 seems a good and popular selection.

Randy

-------------- Original message -------------- 

Piped correctly, this engine has enough grunt to turn much larger props. I've seen it turn a 17x10 cut back to 16" on a 81/2 pound model. Nat Penton had it on his VooDoo Xpress with a stretched pipe (60 sized), and it ran around 7600 rpm. Very nice performance; would hover at half throttle.

MattK

In a message dated 2/4/2005 9:57:01 AM Eastern Standard Time, randy10926 at comcast.net writes:
The 14X7 seems to be popular with people flying the widebody60 with OS90FX with a stock muffler.  I used a 13X8 apc with this engine on a Excelleron90.  Flies nice; but did not have enough vertical for me on the stock muffler.

Randy

-------------- Original message -------------- 

> I know this question has been asked a thousand times but... What are good 
> prop choices for an OS 91FX in an 8 - 8.25 lb pattern plane? The LHS has 
> quite a few "sport" APC props, but only a few "pattern" props. I know the 
> blade shape is different. I picked up a 13x8 "sport" to break it in with. 
> Just wondering what to expect from each one and what I should consider good 
> for tach. readings (no pipe - just the stock muffler). I've got some ground 
> clearance so I can swing a pretty large prop if necessary. TIA. 
> 
> John Pavlick 
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